Every time I try to execute the GSBInstaller.exe I get an error message saying:

‘‘Unable to execute file in the temporary directory. Setup aborted.
Error 5:’’

Are you possibly running as a ‘limited user’ under windows XP or vista? This should not matter, but maybe it does? At what point does the installer crash? immediately?
We sue inno setup, which is a popular installer package. I have googled a bit and there is a suggestion that this might be anti-virus software being a bit paranoid. Are you running any anti-virus software maybe?

The administrator privileges shouldn’t be any problem so that not it , I’ll try disabling my antivir program.